There are other tunneling solutions that support both and https, websockets using ssh tunnels for the communication. For example I use https://tuns.sh which is a managed sish instance

The current implementation is HTTP-focused as that was the primary use case. TCP tunneling is possible architecturally but not something I've had in mind. I suggest start by raising an issue on GitHub and adding thumbs up. If it receives enough attention, I will prioritize it. I am less familiar with what would supporting UDP entail, so cannot answer that right now.